單項(xiàng)選擇題

In more recent years, （） heat exchangers have frequently been employed for jacket water and oil cooling.

A.shell and tube type
B.plate type
C.coil type
D.conical disc type

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單項(xiàng)選擇題

To avoid impingement attack, care must be taken with the water （） through the tubes of the heat exchangers.

A.temperature
B.velocity
C.density
D.viscosity

單項(xiàng)選擇題

A non-return valve in the air delivery line near to the compressor must be （）type similar to the compressor discharge valve.

A.the low inertia
B.the high inertia
C.the low velocity
D.the high velocity